Rivet.



H. H. HBRKENS.

RRRR T. APPLIGATION FILED SEPT. so, 1'913.

150592,362'. Patented Apr. 7, 1914L i 1 un if T HERKEN HIERONYIVIUSHERKENS, OF GILIVIAN, ILLINOIS.

RIVET.

Specification of Letters Patent.

Patented Apr. *7, 1914.

Application filed September 30, 1913. Serial No. 792,674.

To all whom t may concern Be it known that I, HERKEN H. I-IERKENS, acitizen of the United States, residing at Gilman, in the county ofIroquois and State of Illinois, have invented a new and useful Rivet, ofwhich the following is a specification.

This invention has reference to improvements in rivets and is designedto provide a rivet which may be secured in place Without the employmentof a hammer or a like tool.

In accordance with the present invention the rivet comprises a bodymember composed of a stem and a head thereon, and another head memberrelated to the body member to be screwed thereon, the stem of the -bodymember being threaded and the separate head member being formed with athreaded socket, while the stem of the body member has a continuationbeyond the threaded portion and the separate head has its socket portionterminating in a Haring groove into which the extended end of the stemof the body member is expanded, thus holding the parts so rmly togetherthat they will not separate unless subjected to a twisting force thereverse of that by which the two parts are applied one to the other.

The invention will be best understood from a consideration of thefollowing detailed description taken in connection with the accompanyingdrawings forming part of this specication, with the furtherunderstanding that while the drawings show a practical form of theinvention, the latter is not confined to any strict conformity with theshowing of the drawings but may be changed and modied so long as suchchanges and modifications mark no material departure from the salientfeatures of the invention.

In the drawings z-Figure 1 is a section showing the improved rivetapplied, some parts of the rivet being shown in elevation. Fig. 2 is adiametric section of the separable head of the rivet. Fig. 3 is anelevation of the body portion of the rivet. Fig. 4 is a plan view of thehead of the rivet. Fig. 5 is a plan view of the body portion of therivet as viewed from the stem side. Fig. 6 is a plan view of the bodyportion of the rivet as viewed from the side remote from the stem. Fig.7 is a detail section of the free end of the stem of the body portion ofthe rivet.

Referring to the drawings the rivet is shown as composed of a bodymember 1 and a separate head member 2. The body member 1 consists of astem 3 and an expanded head 4 corresponding generally to the stem andhead ofV an ordinary rivet. The separable head 2 is indicated asplano-convex, although not necessarily of such form, but is madesomewhat thicker, especially in its central portion, than a washer suchas is provided for use with an ordinary rivet. The stem 3 of the bodyportion of the rivet is screw threaded for a portion of its length, asindicated at 5, while at the end of the screw threaded portion remotefrom the head 4 the stem has a continuation 6 formed with an axialentering socket 7 therein, and this socketed extension 6 is slitlongitudinally at a suitable number of points, as indicated at 8.

The head 2 is provided on its plane face with a central internallythreaded socket 9 extended for an appropriate distance t-oward theconvex face of the head 2, and from thence there is formed into the headtoward the convex face a plain flaring groove 10 of conical contour,thereby forming at the inner end of the threaded socket 9 a flaring boss11 axially related to the longitudinal axis of the socket 9 andexpanding therefrom. The convex face of the head 2 is provided withsockets 12 on opposite sides of its axis for the application of a pinwrench or other suitable tool, while that face of the head 4 of the bodyportion of the rivet remote from the stem 3 has an elongated recess 13formed therein permitting the application of a screw driver or otherproper tool.

In Fig. 1 there are shown two members 14, 15, respectively, which may betaken as indicative of two structures to be united by the rivet, andspecifically these two members 14, 15 may be considered as two straps"of leather or plates or strips of metal to be joined together. As iscustomary, matching holes are formed through the two straps 2 of therivet is applied to the threaded portion of the stem and screwed thereontoward the washer 16 and ultimately the screwing action will cause anengagement of the socketed extension 6 with the flaring boss 11. Acontinued screwing of the head 2 on to the stem results in expanding theslit end 6 into the flaring groove 10, t-he metal of the rivet bendingoutwardly in response to the applied forces. By the time the head 2 isseated in clamping relation to the body of the rivet and the members 14and 15 on the stem of the rivet, the slit end .6 has become firmlyseated in the groove 10 and any force tending to separate the head 2from the body of the rivet is resisted both by the screw threads and bythe expanded end of the stem 3, so .that the rivet holds to the limitofl the strength of materials employed. Should, however, it be desiredto remove the rivet the head 2 has simply to be unscrewed, whereupon theexpanded head 6 collapses toward its first po-sition and `no longerinterferes with the linal removal of the head 2, so that the head may beused repeatedly until some part of t-he structure breaks.

What is claimed is l. A rivet comprising a body portion having a stemand a head at one end of the stem, and the other end of the stemthreaded and formed with a continuation beyond the threaded part havingan axial socket producedV therein, and a removable head provided with' athreaded socket for the reception of the threaded portion of the stemand a flaring annular groove at the inner end of the socket adapted toreceive and spread the socketed continuation at the free end of thestem.

2. A rivet comprising a body portion having a stem and a head at one endo-f the stem, and the other end of the stein threaded and formed with acontinuation beyond the threaded part having an axial socket producedtherein, and a removable head proand a continuation beyond the screwthreaded portion and there free from screw threads, said continuationbeing formed with an axial entering socket, and a separate head madethinner from the central portion toward the margins and at the centralportion provided with a threaded socket havingV its inner end continuedas a flaring annular groove free from screw threads and adapted toreceive and spread the socketed free end of the stem.

4. A rivetcomprising a stem having a,

head formed at one end and at the other end provided with external screwthreads and a continuation beyond the screw threaded portion and therefree from screw threads, said continuation being formed with an axialrentering socket, and a separate head made thinner from the centralportion toward the margins and at the central portion provided with athreaded socket having its inner end continued as a flaring annulargroove free from screw threads and adapted to receive and spread thesocketed free end of the stem, both heads of the rivet being providedwith vmeans fo-r the application of manipulating tools. c

In testimony, that I claim the foregoin as my own, I have hereto affixedmy signature in the presence of two witnesses.

HERREN HIERONYMUS HERKENS.

Vitnesses:

JRGEN Fnnnrexs, FRED TAMMEN.

f Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

